The department is urging people to stay away from the area.
Capitol police officers are investigating a suspicious vehicle near the Supreme Court, the agency tweeted on Tuesday morning.
The department is urging people to stay away from the area.
There were no disruptions to operations at the Supreme Court; oral arguments began as planned at 10 a.m. local time.
The Supreme Court building remains closed to the public.
This is a developing story. Please check back for updates.
ABC News’ Devin Dwyer contributed to this report.
